Table S1: Sites in southern France (F) and north-eastern Romania (R) sampled during 2013 and 2014 to monitor the phenology of Ceutorhynchus assimilis.
Site Coordinates Altitude Type # Plants Size m2 St-Clément-de-Rivière 1 (F) 43°70’N, 3°85’E 63 Field edge 766 100 St-Clément-de-Rivière 2 (F) 43°70’N, 3°84’E 102 Roadside 714 150
St-Gély-du-Fesc (F) 43°68’N, 3°82’E 97 Ruderal 1485 800
Les Matelles (F) 43°42’N, 3°50’E 53 Field edge 725 80